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I noticed that there were three very round holes in the temporal bones of the skull that appeared to have been made by a continuous motion (something going in one end and out the other). I saw somebody on Facebook suggest that these could be bullet holes, but given this skull was probably an old medical specimen is it possible that it was made by some kind of surgical tool like a bone drill? Or is this just something that’s naturally there on all of our skulls and I’m just being really stupid? I know this isn’t where the openings for the ears are.